Observation of e^+e^- to γ chi_{c1} and search for e^+e^- to γ chi_{c0}, γ chi_{c2}, and γη_c at sqrt{s} near 10.6 GeV at Belle

Belle Collaboration: S. Jia , X. L. Wang , C. P. Shen , C. Z. Yuan , I. Adachi , H. Aihara , S. Al Said , D. M. Asner

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H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu V. Bansal P. Behera C. Beleno M. Berger B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bra\v{c}ko T. E. Browder L. Cao D. \v{C}ervenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo Z. Dole\v{z}al T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash M. Gelb A. Giri P. Goldenzweig D. Greenwald J. Haba K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs Y. Jin D. Joffe J. Kahn A. B. Kaliyar G. Karyan T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim H. J. Kim J. B. Kim S. H. Kim K. Kinoshita P. Kody\v{s} S. Korpar D. Kotchetkov P. Kri\v{z}an R. Kroeger P. Krokovny T. Kuhr R. Kulasiri R. Kumar A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee J. Y. Lee S. C. Lee C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby Z. Liptak D. Liventsev P.-C. Lu M. Lubej J. MacNaughton M. Masuda T. Matsuda D. Matvienko M. Merola H. Miyata R. Mizuk T. Mori R. Mussa E. Nakano M. Nakao K. J. Nath M. Nayak N. K. Nisar S. Nishida S. Ogawa H. Ono Y. Onuki W. Ostrowicz G. Pakhlova B. Pal S. Pardi S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. Ritter A. Rostomyan G. Russo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior T.-A. Shibata J.-G. Shiu F. Simon A. Sokolov E. Solovieva M. Stari\v{c} Z. S. Stottler J. F. Strube T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida Y. Tao F. Tenchini M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. van Tonder G. Varner K. E. Varvell V. Vorobyev E. Waheed B. Wang C. H. Wang M.-Z. Wang P. Wang S. Watanuki E. Widmann E. Won H. Yamamoto S. B. Yang H. Ye J. H. Yin Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov

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classification ✦ hep-ex hep-ph

keywords gammasigmabellecenter-of-masscrossenergiessectionssignificant

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Using data samples of 89.5~fb$^{-1}$, 711.0~fb$^{-1}$, and 121.4~fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider at center-of-mass energies 10.52 GeV, 10.58 GeV, and 10.867 GeV, respectively, we study the exclusive reactions $e^+e^-\to\gamma\chi_{cJ}$ ($J = 0,~1,~2$) and $e^+e^-\to\gamma\eta_c$. A significant $\gamma \chi_{c1}$ signal is observed for the first time at $\sqrt{s}=10.58$ GeV with a significance of $5.1\sigma$ including systematic uncertainties. No significant excesses for $\gamma \chi_{c0}$, $\gamma \chi_{c2}$, and $\gamma \eta_c$ final states are found, and we set 90\% credibility level upper limits on the Born cross sections ($\sigma_{\rm B}$) at 10.52 GeV, 10.58 GeV, and 10.867~GeV. Together with cross sections measured by BESIII at lower center-of-mass energies, the energy dependency of $\sigma_{\rm B}(e^+e^-\to\gamma\chi_{c1})$ is obtained.

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Observation of e^+e^- to γ chi_{c1} and search for e^+e^- to γ chi_{c0}, γ chi_{c2}, and γη_c at sqrt{s} near 10.6 GeV at Belle

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